Wireless Medical Gases Management System

ABSTRACT

The present invention generally provides methods and systems for managing a medical gas system by using wireless sensors located at the point of use. In one embodiment, a wireless sensor is fixed to a gas outlet, and is configured to measure gas flow, and to detect whether the gas outlet is connected to a medical device. The gas flow and connection data is included in a wireless signal that is transmitted to a remote server. The data received by the server may be analyzed to determine if any local or system leaks are occurring. In addition, the data may be used to monitor patient therapies, to calculate costs, and to determine replenishment points.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. Non-Provisional applicationSer. No. 11/735,862, filed Apr. 16, 2007 which is herein incorporated byreference.

BACKGROUND

In modern medical facilities such as hospitals, there is typically aneed to supply medical gases to various points of use, for examplepatient rooms, operating rooms, examination rooms, and the like.Commonly, the medical gases are centrally stored, and then distributedto various points of use by a network of gas conduits. Typically, thesupply of gases in such facilities is monitored by measuring the gaspressure (or liquid level, for gases stored in liquid form) at thestorage container (e.g., pressure cylinder or tank). When the availableamount falls below a predefined minimum level, additional quantities areordered to replenish the gas supplies.

However, this approach is only suitable for managing the global (i.e.,system-wide) usage of medical gases, and does not provide measurementsof gas consumption at specific points of use. Conventionally, thelocalized management of medical gases is performed by manually settingflow rates at each point of use, and then manually collecting the flowrate data. However, these manual approaches are tedious andtime-consuming.

Additionally, such conventional approaches do not provide the ability todetect and isolate gas leaks. Leaks can occur for various reasons, suchas equipment not being connected properly, valves being left open,cracks in pipes, etc.

Therefore, there is a need for improved techniques for the management ofmedical gases.

SUMMARY

One embodiment of the invention provides a method for monitoring the useof medical gases, comprising: receiving, from a flow sensor fixed to amedical gas conduit, a wireless signal indicating the presence of a flowof gas through the conduit, wherein the conduit carries gas to a gasoutlet; determining whether a medical device is properly connected tothe outlet; and if not, generating an alert communicating the existenceof a potential leak at the gas outlet.

Another embodiment of the invention provides a method for monitoring theuse of medical gases, comprising: receiving a plurality of wirelesssignals, each coming from one of a plurality of flow sensors, whereineach flow sensor is configured to measure the flow rate of gas throughone of a plurality of gas outlets, wherein the gas flowing to theplurality of gas outlets is supplied by a gas delivery system fluidlycoupled to at least one gas source; determining, based on the pluralityof wireless signals, the total amount of gas used at the plurality ofgas outlets; determining, based on one or more measurements of the atleast one gas source, the amount of gas that has been removed from theat least one gas source; determining whether the total amount of gasused at the plurality of gas outlets differs, by a predetermined margin,from the amount of gas that has been removed from the at least one gassource; and if so, generating an alert communicating the existence of apotential leak in the gas delivery system.

Yet another embodiment of the invention provides a computer-readablestorage medium storing instructions which when executed by a processor,performs a method, comprising: receiving, from a flow sensor fixed to amedical gas conduit, a wireless signal indicating the presence of a flowof gas through the conduit, wherein the conduit carries gas to a gasoutlet; determining whether a medical device is properly connected tothe outlet; and if not, generating an alert communicating the existenceof a potential leak at the gas outlet.

Yet another embodiment of the invention provides a computer-readablestorage medium storing instructions which when executed by a processor,performs a method, comprising: receiving a plurality of wirelesssignals, each coming from one of a plurality of flow sensors, whereineach flow sensor is configured to measure the flow rate of gas throughone of a plurality of gas outlets, wherein the gas flowing to theplurality of gas outlets is supplied by a gas delivery system fluidlycoupled to at least one gas source; determining, based on the pluralityof wireless signals, the total amount of gas used at the plurality ofgas outlets; determining, based on one or more measurements of the atleast one gas source, the amount of gas that has been removed from theat least one gas source; determining whether the total amount of gasused at the plurality of gas outlets differs, by a predetermined margin,from the amount of gas that has been removed from the at least one gassource; and if so, generating an alert communicating the existence of apotential leak in the gas delivery system.

Yet another embodiment of the invention provides a system, comprising: amedical facility, comprising: a plurality of locations configured forpatient care, each comprising at least one gas fixture, wherein each gasfixture is configured to connect to and supply medical gases to at leastone medical device; at least one medical gas source; at least onewireless receiver; a plurality of gas conduits, configured to distributemedical gases from the at least one gas source to each of the gasfixtures. In addition, the system further comprises a plurality ofwireless sensors disposed on the plurality of gas fixtures, eachcomprising: a flow sensor configured to measure a flow of gas throughthe gas fixture on which it is disposed, a connection sensor configuredto determine whether a medical device is properly connected to the gasfixture on which it is disposed, and a wireless transmitter configuredto transmit a wireless signal to the at least one wireless receiver,wherein the wireless signal includes data indicating whether a flow ofgas is detected and whether a medical device is properly connected. Inaddition, the system further comprises a gas management application,configured to receive the data included in the wireless transmissions,and to selectively generate alerts communicating the existence of apotential leaks at the gas fixtures based on the received data.

Yet another embodiment of the invention provides a system, comprising: amedical facility, comprising: a plurality of locations configured forpatient care, each comprising at least one gas fixture, wherein each gasfixture is configured to connect to and supply medical gases to at leastone medical device; a medical gas storage facility, comprising a flowmeter configured to measure a total gas flow rate from the storagefacility; at least one wireless receiver; and a plurality of gasconduits configured to distribute medical gases from the at least onegas storage facility to each of the gas fixtures. In addition, thesystem further comprises a plurality of wireless sensors disposed on theplurality of gas fixtures, each comprising: a flow sensor configured tomeasure a flow of gas through the gas fixture on which it is disposed, aconnection sensor configured to determine whether a medical device isproperly connected to the gas fixture on which it is disposed, and awireless transmitter configured to transmit a wireless signal to the atleast one wireless receiver, wherein the wireless signal includes dataindicating whether a flow of gas is detected and whether a medicaldevice is properly connected. In addition, the system further comprisesa gas management application, configured to receive the data included inthe wireless transmissions, and to selectively generate an alertcommunicating the existence of a potential leak in the plurality of gasconduits based on the received data.

BRIEF DESCRIPTION OF THE DRAWINGS

For a further understanding of the nature and objects of the presentinvention, reference should be made to the following detaileddescription, taken in conjunction with the accompanying drawings, inwhich like elements are given the same or analogous reference numbersand wherein:

FIG. 1 illustrates an example of a typical medical gas environment;

FIG. 2 illustrates a block diagram of a networked system, according toone embodiment of the invention;

FIG. 3 illustrates a block diagram of a wireless sensor, according toone embodiment of the invention; and

FIG. 4 is a flow diagram depicting a method for the management ofmedical gases, according to one embodiment of the invention.

FIG. 5 illustrates a display screen of an application for the managementof medical gases, according to one embodiment of the invention.

DESCRIPTION OF PREFERRED EMBODIMENTS

Embodiments of the present invention generally provide methods andsystems for managing a medical gas system by using wireless sensorslocated at the point of use. In one embodiment, a wireless sensor isfixed to a gas outlet, and is configured to detect any flow of gas, andto detect whether the gas outlet is connected to a medical device. Thesignal from the wireless device is transmitted to a remote server. Ifthe data carried by the signal (either by itself or in combination withother data) indicates that gas is flowing through the gas outlet, andthat no device is connected to the gas outlet, the server generates analert of a localized leak. In one embodiment, the wireless sensor isconfigured to transmit the gas flow rate passing through the gas outlet.This data may be used to calculate the total gas used at that point ofuse. The total gas may then be used to determine when a patient hasreceived a prescribed amount of gas, and/or to calculate a bill for theexpense of the gas. In another embodiment, wireless sensors may be fixedto all gas outlets in a medical gas system. By summing the gas flow rateat all gas outlets, and comparing to the gas flow rate measured at acentral gas storage facility, it may be determined whether there anyleaks in the medical gas system. In another aspect of the invention, thetotal gas usage for all gas outlets may be compared to a predefinedreorder point in order to determine if the gas supply must bereplenished.

It is contemplated that any of the foregoing embodiments (and otherembodiments disclosed herein) may be done separately or collectively (inany combination) in a given system.

In the following, reference is made to embodiments of the invention.However, it should be understood that the invention is not limited tospecific described embodiments. Instead, any combination of thefollowing features and elements, whether related to differentembodiments or not, is contemplated to implement and practice theinvention. Furthermore, in various embodiments the invention providesnumerous advantages over the prior art. However, although embodiments ofthe invention may achieve advantages over other possible solutionsand/or over the prior art, whether or not a particular advantage isachieved by a given embodiment is not limiting of the invention. Thus,the following aspects, features, embodiments and advantages are merelyillustrative and are not considered elements or limitations of theappended claims except where explicitly recited in a claim(s). Likewise,reference to “the invention” shall not be construed as a generalizationof any inventive subject matter disclosed herein and shall not beconsidered to be an element or limitation of the appended claims exceptwhere explicitly recited in a claim(s).

One embodiment of the invention is implemented as a program product foruse with a networked computer system such as, for example, the networkedsystem 200 shown in FIG. 2 and described below. The program(s) of theprogram product defines functions of the embodiments (including themethods described herein) and can be contained on a variety ofcomputer-readable storage media. Illustrative computer-readable storagemedia include, but are not limited to: (i) non-writable storage media(e.g., read-only memory devices within a computer such as CD-ROM disksreadable by a CD-ROM drive) on which information is permanently stored;(ii) writable storage media (e.g., floppy disks within a diskette driveor hard-disk drive) on which alterable information is stored. Suchcomputer-readable storage media, when carrying computer-readableinstructions that direct the functions of the present invention, areembodiments of the present invention. Other media include communicationsmedia through which information is conveyed to a computer, such asthrough a computer or telephone network, including wirelesscommunications networks. The latter embodiment specifically includestransmitting information to/from the Internet and other networks. Suchcommunications media, when carrying computer-readable instructions thatdirect the functions of the present invention, are embodiments of thepresent invention. Broadly, computer-readable storage media andcommunications media may be referred to herein as computer-readablemedia.

In general, the routines executed to implement the embodiments of theinvention, may be part of an operating system or a specific application,component, program, module, object, or sequence of instructions. Thecomputer program of the present invention typically is comprised of amultitude of instructions that will be translated by the native computerinto a machine-readable format and hence executable instructions. Also,programs are comprised of variables and data structures that eitherreside locally to the program or are found in memory or on storagedevices. In addition, various programs described hereinafter may beidentified based upon the application for which they are implemented ina specific embodiment of the invention. However, it should beappreciated that any particular program nomenclature that follows isused merely for convenience, and thus the invention should not belimited to use solely in any specific application identified and/orimplied by such nomenclature.

Overview of Representative Environment

FIG. 1 illustrates an example of a representative environment 100 of amedical gas system. The environment 100 illustrates aspects of themanagement of medical gases in the prior art. As shown, the environment100 includes a medical facility 105, which includes several patientrooms 110, 120, 130, 140, and a server 170. The environment 100 alsoincludes a gas distribution system 150, which distributes medical gasesfrom a gas storage facility 160 to sets of gas fixtures 115, 125, 135,145 included in the rooms of the medical facility 105. Each set of gasfixtures represents gas equipment that is commonly installed at pointsof use for gas, for example gas connectors, control valves, and thelike. The flow rate of gas to the gas distribution system 150 ismeasured by a flow meter 165 located near the gas storage facility 160.

As shown, room 110 includes the gas fixtures 115, which are notconnected to any medical equipment, and are not releasing any gas(assuming no leaks). Also shown is a room 120, which includes gasfixtures 125 that are providing gas to a connected medical device (e.g.,a ventilator). Thus, in the cases of room 110 and room 120, the medicalgas system is functioning properly. However, in room 120, determininghow much gas has been consumed may require manual readings of anymeasuring devices included in (or connected to) the gas fixtures 125,according to a conventional approach. Such localized measurements may berequired, for instance, to bill a patient for his individual gas usage.Localized measurements may also be required for some medical gases, forexample nitric oxide, which are administered to patients in specificamounts as part of therapeutic treatment.

As shown, room 130 includes the gas fixtures 135 which are providing aflow of gas, but which are not connected to any medical devices. Thus,in the case of room 130, there is a gas leak that may only be detectedby manual inspection of the gas fixtures 135. In some cases, such leaksmay be small, and may thus escape detection by a casual inspection. Suchleaks can lead to the waste of medical gases, and thus result inunnecessary cost. Additionally, leaks of some gases (e.g., oxygen) canpotentially lead to explosions, while leaks of other gases may lead totoxic conditions.

The room 140 illustrates an example in which a medical device isproperly connected to the gas fixtures 145, but is receiving an abnormalflow of gas. This situation may arise, for example, if the controls ofthe device are not set properly, or if the device malfunctions.Detection of an abnormal gas flow may prevent harm to patients ormedical equipment. However, the abnormal gas flow may only be detectedon manual inspection of the medical device.

The gas distribution system 150 may include pipes, tubes, conduits,valves, and the like. As illustrated, the gas distribution system 150may also include a system leak 155. Such leaks may occur at any point inthe gas distribution system 150. If the system leak 155 occurs in alocation that is usually hidden from view (e.g., inside a wall cavity,in a maintenance duct, etc.), or of the system leak 155 is small, it maybe not be noticed, and thus result in an ongoing waste of medical gases.Additionally, such leaks may cause gases to accumulate in hiddenlocations until they result in explosions or other dangerous conditions.

As described, there are situations which arise in medical gas systemsthat may result in waste of medical gases. Such situations are costly,and sometimes dangerous. Accordingly, embodiments of the inventionprovide techniques for detecting these situations. In variousembodiments, one or more measuring and communication (i.e., transmittingand/or receiving) devices are fixed to the points of use (e.g., the gasfixtures 115, 125, 135, 145) of a medical facility. In a particularembodiment, one or more of the communication devices are wireless. Thecommunication devices may communicate with a computer system (such asthe server 170) configured to make various determinations, including thedetecting leaks, monitoring and measuring flow rates, and calculatingconsumption costs of various gases. Embodiments of the invention aredescribed below.

System Overview

Referring now to FIG. 2, a system 200 is shown according to oneembodiment of the present invention. In one embodiment of the invention,the system 200 may include a base station 260 configured to receivewireless signals 280 from a set of wireless sensors 270. Each wirelesssensor 270 may be configured to detect conditions at a remote portion ofa gas delivery system. Such conditions may include the presence of a gasflow, the rate of gas flow, and the proper connection of a devicerequiring medical gases. The wireless signals 280 may conform to anywireless communication protocols including, for example IEEE 802.11,Global System for Mobile Communications (GSM), Bluetooth, or ZigBee.

In one embodiment, the base station 260 communicates with a centralserver 210 (which may be the server 170 of FIG. 1). The processing inthe central server 210 may be performed by a processing unit 212. Theprocessing unit 212 may process programs in a memory 220, including anoperating system 222 for the central database server 210. In addition,the programs may include a gas management application 226 and a billingapplication 228. The gas management application 226 may be configured toreceive and process data from the wireless sensors 270. The gasmanagement application 226 may be further configured to enable themanagement of a medical gas system by way of a web-based user interface(i.e., Internet web pages). The billing application 228 may beconfigured to generate patient bills based on, at least in part, theamounts of medical gases consumed in the patient's care. The processingunit 212 may also process data 224 and other programs or information.Such data and programs may also be stored in a storage device 216 suchas a hard drive or other computer-readable medium (e.g., a compact discor read-only memory). The central server 210 may utilize an input/outputinterface 214 to request and/or receive data from the network 250.Internal components of the central server 210 may communicate via a databus 218.

A workstation 230 may be used to access the central server 210 over thenetwork 250 and to access the gas management application 226. In oneembodiment, processing in the workstation computer 230 may be performedby a processing unit 232. The processing unit 232 may process programsin a memory 240 including an operating system 242 for the workstationcomputer 230. In addition, the processing unit 232 may also process data244 and other programs such as a web browser 246 and a patient monitor248. The web browser 246 may be used to access web applications on thecentral server 210, such as the gas management application 226. Thus,the web browser 246 may be used to remotely monitor and manage a medicalgas system. The patient monitor 248 may be used, for example, to enablea doctor or nurse to monitor the amount of a medical gas administered toa patient as part of a prescribed treatment regimen. Such data andprograms may also be stored in a storage device 236 such as a hard driveor other computer-readable medium (e.g., a compact disc or read-onlymemory). The workstation computer 230 may utilize an input/outputinterface 234 to request and/or receive data from the network 250.Internal components of the workstation computer 230 may communicate viaa data bus 238.

Wireless Sensor

FIG. 3 illustrates a block diagram 300 of a wireless sensor 270,according to one embodiment of the invention. As shown, the wirelesssensor 270 may be fixed to a gas supply conduit 360, and may be locatedin proximity to a control valve 362 and a gas connector 364. The controlvalve 362 may be used to control the supply of gas to a point of use.The gas connector 364 is used to connect a device requiring a supply ofa medical gas (e.g., an oxygen ventilator), illustrated in FIG. 3 by amedical gas device 370. In a typical situation, the control valve 362,the wireless sensor 270, and the gas connector 364 may be fixed in aparticular point of use of a medical care facility (e.g., as part of gasfixtures 115, 125, 135, 145).

In one embodiment, the wireless sensor 270 may include a connectionsensor 320 and a flow meter 330, each connected to a wirelesstransponder 310. The connection sensor 320 may be configured to detectwhen a medical gas device 370 is properly connected to the gas connector364. The connection sensor 320 may operate by any technique known in theart suitable for detecting a proper connection, e.g., electrical contactsensors, pressure switches, optical sensors, magnetic switches,radio-frequency identification (RFID) sensors, and the like.

In one embodiment, the flow meter 330 may be configured to measure therate of flow of gases passing through a conduit or through the flowmeter 330. In another embodiment, the flow meter 330 may instead beconfigured to detect the presence of a gas flow, without measuring therate of the flow. In yet another embodiment, the flow meter 330 may beconsist of two components, one configured to measure the rate of flow ofgases, and another to detect the presence of a gas flow. It iscontemplated that the flow meter 330 may be configured in a variety ofmanners as suited to the intended use.

As shown, the wireless transponder 310 is configured to transmit awireless signal 280 to a base station 260. The wireless signal 280 maybe based on the data generated by the connection sensor 320 and a flowmeter 330. That is, the wireless signal 280 may include data describingthe flow of gas through the wireless sensor 270 (e.g., the flow rate ofgas), and the connection status of the gas connector 364 (e.g., properlyconnected to a medical device). In one embodiment, the flow rate datagenerated by the flow meter 330 may be transmitted to the server 210,and then processed by an application for the management of a gas system(e.g., gas management application 226 illustrated in FIG. 2). Further,the flow rate data may be used by to generate a patient bill using, forexample, the billing application 228. Furthermore, the flow rate datamay be used to monitor a patient's status in undergoing a prescribedtreatment with medical gases. This function may be performed using, forexample, the patient monitor 248.

In one embodiment, the wireless transponder 310 may be configured toreceive wireless signals 280 from the base station 260, with suchsignals including commands for the operation of the wireless sensor 270(e.g., to activate the sensor, to run a diagnostic test, etc.).Additionally, the wireless sensor 270 may be configured to control othercomponents of the gas management system. For example, the wirelesssensor 270 may be configured to actuate a control valve 362 in responseto commands received via wireless signals 280. This action may beperformed if a patient has completed a prescribed treatment by receivinga given amount of medical gases.

Of course, the example illustrated in FIG. 3 is provided forillustrative purposes only. It is contemplated that other embodimentsmay be used to advantage. In one embodiment, the components of wirelesssensor 270 may be used as separate components. For example, flow sensor330 may be located upstream of the control valve x, and the proximitysensor 320 may be fixed to a medical device. Additionally, multiplewireless sensors 270 may be disposed at various points of the gasdistribution network 150. By detecting any differences in the flow ratesat each point of the gas distribution network 150, any leaks may beisolated to a specific gas supply conduit 360. In another embodiment,the flow sensor 330 and the proximity sensor 320 may each be configuredwith its own wireless transponder 310. In yet another embodiment, thewireless sensor 270 may be mounted on a mobile medical gas device (e.g.,on a portable oxygen unit, or on an anesthesia cart). Any of theseembodiments, as well as any other beneficial arrangement of thecomponents of the invention, are included in the scope of the invention.

Flow Diagram of Method

FIG. 4 is a flow diagram depicting a method 400 for the management ofmedical gases, according to one embodiment of the invention. The method400 begins at step 410, where the method 400 enters a loop (defined bysteps 420, 430, 435, 440, 442, 444, 450, 452, and 454) for processingdata received from each wireless sensor of multiple wireless sensorsincluded in a medical gas system (e.g., wireless sensor 270 illustratedin FIG. 3). Each wireless sensor may monitor a gas outlet at a point ofuse of the medical gas system. Some examples of such points of use areillustrated by the gas fixtures 115, 125, 135, and 145 shown in FIG. 1.By processing the data of all wireless sensors, the method 400 may beused to provide an overall view of the entire system, and thus enablethe management of the medical gas system.

At step 420, it is determined whether there is any gas flow detected.This step may be based on data collected, for example, by a flow meter330 included in a wireless sensor 270. If no gas flow is detected (e.g.,gas fixtures 115 shown in FIG. 1), the method 400 returns back to step410 to evaluate the next wireless sensor. Otherwise, the method 400continues to step 430, where it is determined whether any device isproperly connected to the gas outlet (e.g., a medical gas device 370connected to a gas connector 364). If not, the state exists where a gasflow has been detected (i.e., at step 420), but no device is connectedto use the gas flow (e.g., gas fixtures 135 shown in FIG. 1). Thus, atstep 435, an alert of a local leak is sent to the central server (e.g.,a wireless signal 280 may be sent to the base station 260 connected to aserver 210).

The method 400 continues at step 440, where the gas flow rate ismeasured (e.g., by flow meter 330). Next, at step 442, it is determinedwhether the measured flow rate is within a predefined range of normaloperating flow rates. The predefined range may be based, for example, onthe types of medical devices known to be used with the medical gassystem. If the measured flow rate is outside the predefined range (e.g.,gas fixtures 145 shown in FIG. 1), the method 400 continues to step 444,where an alert of abnormal flow rate is sent to the central server.

The method 400 continues at step 450, where the measured flow rate isused to calculate a total amount of gas used at that particular point ofuse over a given time period. The calculated amount may be used, forexample, for billing a patient for his individual gas usage. Next, atstep 452, it is determined whether the calculated amount is equal to (orgreater than) a required amount that is prescribed for the patientlocated at the particular point of use. As is known in the art, a doctormay prescribe a treatment regimen which may include administering arequired amount of medical gas to a patient over a period of time. Ifthe patient has received the required amount of gas, the method 400continues to step 454, where an alert of completed treatment is sent tothe central server.

Once the processing of the data from all the wireless sensors of themedical gas system has been completed at step 410, the method 400continues at step 460, where a sum is calculated of the flow ratesmeasured at step 440. Thus, the calculated sum represents the cumulativetotal of the gas flows measured at each point of use. Next, at step 462,the calculated sum is compared to a global flow rate, as measured at acentral gas storage location (e.g., gas storage facility 160 illustratedin FIG. 1). If the calculated sum is less than the global rate, then themethod 400 continues to step 464, where an alert of a system leak issent to the central server. A system leak may indicate that a hiddenleak exists somewhere in the gas distribution network of the medical gassystem (e.g., leak 155 shown in FIG. 1). Thus, the system leak alert maybe used to, for example, notify maintenance personnel to search for andrepair the leak.

The method 400 continues at step 470, where the calculated sum of flowrates is used to calculate a total amount of gas used globally (i.e.,for the entire system) over a given time period. Next, at step 472, theglobal amount of gas used is evaluated to determine if it has reached apredefined reordering level. The reordering level may be set such that,taking into account the current consumption rate and the average timerequired by suppliers to replenish the gas supply, the new gas supplywill arrive shortly before the old gas supply runs out. If the globalamount of gas used has not reached the reordering level, the method 400ends. Otherwise, the method 400 continues to step 474, where a reorderalert may be sent. In addition, step 474 may include sending areplenishment order to the supplier using, for example electronic datainterchange (EDI) or web technologies to transmit the order. After step474, the method 400 ends.

Exemplary Gas Management Application Display

FIG. 5 illustrates a display screen 500 of an application for themanagement of medical gases, according to one embodiment of theinvention. The display screen 500 may be a graphical user interface(GUI) for the gas management application 226 illustrated in FIG. 2. Inone embodiment, the display screen 500 may be viewed by a user at aserver (e.g., server 170 shown in FIG. 1 or the server 210 of FIG. 2).Additionally, the display screen 500 may be viewed by user at aworkstation (e.g., using web browser 246 on workstation 230 illustratedin FIG. 2).

As shown, the display screen 500 includes a room status summary 510, asystem status summary 540, and a set of control buttons 550. The controlbuttons 550 may enable the user to perform typical functions in the GUI,such as entering data, modifying settings, cancelling commands, etc. Theroom status summary 510 provides a user with a summary of the status ofpoints of use of a medical gas system. As shown, the room status summary510 includes a “PATIENT ROOM” column 520, which identifies a particularpoint of use. In this example, the “PATIENT ROOM” column 520 indicatesthat the rows 530, 532, 534, 536 correspond to the rooms 110, 120, 130,140 shown in FIG. 1.

The room status summary 510 also includes a “FLOW DETECTED” column 522,a “LOCAL LEAK” column 524, an “ABNORMAL FLOW” column 526, a “COMPLETEDTREATMENT” column 528, and a “BILL FOR GAS USAGE” column 529. Thesecolumns generally correspond to the steps of method 400, as describedabove. In this example, the specific column values correspond to thesituations illustrated in FIG. 1. More specifically, the “FLOW DETECTED”column 522 of row 530 indicates that room 110 does not have any detectedgas flow. In the case of row 532, the “COMPLETED TREATMENT” column 528contains the word “ALERT,” indicating that the patient in room 120 hascompleted a treatment regimen of a prescribed amount of a medical gas.This alert may be generated, for example, by the patient monitor 248shown in FIG. 2. Row 534 includes an alert for the “FLOW DETECTED”column 522, indicating that a gas flow is detected in room 130, but nomedical device is properly connected. Row 536 includes an alert in the“ABNORMAL FLOW” column 526, indicating that room 114 is receiving a gasflow outside a predetermined range of operating flow rates. In the caseof rooms 120 and 140, the “BILL FOR GAS USAGE” column 529 indicates thecurrent bill for the patient's gas usage.

As shown, the system status summary 540 includes a “SYSTEM LEAK” warning542. If the sum of the flow rates detected at each room is less than theflow rate measured at a central storage point, there is a possibility ofa leak in the gas distribution system (e.g., leak 155). If so, the“SYSTEM LEAK” warning 542 would indicate an alert. The system statussummary 540 also includes a “REORDER” warning 544, indicating whetherthe total gas consumed over a period of time has reached a reorderingpoint.

Preferred processes and apparatus for practicing the present inventionhave been described. It will be understood and readily apparent to theskilled artisan that many changes and modifications may be made to theabove-described embodiments without departing from the spirit and thescope of the present invention. The foregoing is illustrative only andthat other embodiments of the integrated processes and apparatus may beemployed without departing from the true scope of the invention definedin the following claims.

What is claimed is:
 1. A method for monitoring the use of medical gasesin a wireless medical gas management system, comprising: providing atleast one medical gas source, at least one medical device, at least onemedical gas outlet that is configured to connect to and supply medicalgas from the at least one medical gas source to at least one medicaldevice, a plurality of medical gas conduits configured to distribute themedical gas from the at least one medical gas source to each of themedical gas outlets, and at least one wireless flow sensor fixed to themedical gas conduits; receiving, from the wireless flow sensor fixed tothe medical gas conduit, a wireless signal indicating the presence of aflow of gas through the medical gas conduit, wherein the medical gasconduit carries gas to the gas outlet; determining whether the medicaldevice is properly connected to the gas outlet; and if not, generatingan alert communicating the existence of a potential leak at the gasoutlet.
 2. The method of claim 1, wherein determining that a medicaldevice is properly connected to the outlet comprises: receiving, from aconnection sensor fixed to the outlet, a wireless signal indicative of astatus of the connection of the medical device to the outlet.
 3. Themethod of claim 1, wherein the wireless signal also indicates a flowrate of gas through the conduit, and further comprising: determiningwhether the flow rate of gas is outside a predetermined range ofacceptable flow rates; and if so, generating an alert communicating theexistence of an abnormal flow rate at the outlet.
 4. A method formonitoring the use of medical gases in a wireless medical gas managementsystem, comprising: providing at least one medical gas source, at leastone medical gas outlet, a plurality of medical gas conduits configuredto distribute the medical gas from the at least one medical gas sourceto each of the medical gas outlets, and at least one wireless flowsensor fixed to the medical gas conduits; receiving, from a flow sensorfixed to a medical gas conduit, a wireless signal indicating a flow rateof gas through the conduit, wherein the conduit carries gas from atleast one medical gas source to a gas outlet; and calculating, from theflow rate of gas, a total amount of gas used at the outlet over a givenperiod.
 5. A computer-readable storage medium storing instructions whichwhen executed by a processor, performs a method, comprising: receiving,from a flow sensor that is fixed to a medical gas conduit configured todistribute medical gas from at least one medical gas source to at leastone medical gas outlet a wireless signal indicating the presence of aflow of gas through the conduit, wherein the conduit carries the gas tothe gas outlet; determining whether a medical device is properlyconnected to the gas outlet; and if not, generating an alertcommunicating the existence of a potential leak at the gas outlet. 6.The computer-readable storage medium of claim 5, wherein determiningthat a medical device is properly connected to the outlet comprises:receiving, from a connection sensor fixed to the outlet, a wirelesssignal indicative of a status of the connection of the medical device tothe outlet.
 7. The computer-readable storage medium of claim 5, whereinthe wireless signal also indicates a flow rate of gas through theconduit, and further comprising: determining whether the flow rate ofgas is outside a predetermined range of operating flow rates; and if so,generating an alert communicating the existence of an abnormal flow rateat the outlet.
 8. The computer-readable storage medium of claim 7,further comprising: calculating, from the flow rate of gas, a totalamount of gas used at the gas outlet over a given period of time.
 9. Amethod for monitoring the use of medical gases in a wireless medical gasmanagement system, comprising: providing at least one medical gassource, at least one ventilator, at least one medical gas outlet that isconfigured to connect to and supply medical gas from the at least onemedical gas source to at least one ventilator, a plurality of medicalgas conduits configured to distribute the medical gas from the at leastone medical gas source to each of the medical gas outlets, and at leastone wireless flow sensor fixed to the medical gas conduits; receiving,from the wireless flow sensor fixed to the medical gas conduit, awireless signal indicating the presence of a flow of gas through themedical gas conduit, wherein the medical gas conduit carries gas to thegas outlet; determining whether the ventilator is properly connected tothe gas outlet; and if not, generating an alert communicating theexistence of a potential leak at the gas outlet.